Feed Strategy - October 2019 - 32

32 ❙ FeedStrategy

Grinding:
benefits of
particle size
modification
The influence of equipment and
settings on particle size and
particle distribution during feed
processing
MEIKE RÜHLE

M

ost raw materials used in feed mills
must be ground. This process improves
the performance of the animal and feed
processing, especially mixing homogeneity and
pellet quality. Grinding is a key step in the feed
production process and offers numerous possibilities
for modification and optimization.

Characterization of particle size,
influence of the type of mill
The two main parameters that define particle size are
particle size distribution and d50 value. Particle size
distribution defines the proportions of the particles
with a specific size in a sample.
Figure 1 shows the cumulative (continuous lines,
sum of all proportions) and the density distribution
curve (dotted lines, single proportions). The d50 value
is the average particle size of this particle size distribution. This means that 50% of the particles are finer and
50% are coarser than d50 (see figure 1, marked with a
red line). Bulk materials with the same d50 value can
have deviating particle size distributions. This demonstrates the importance of both values for the characterization of particle size.

Figure 1 further demonstrates the impact of
different kinds of mills on particle size distribution.
The narrowest distribution can be achieved with a
roller mill whereas a hammer mill produces wider
particle size distributions and, therefore, higher
amounts of fine and coarse particles.
A further factor influenced by the mill is the
particle shape. On roller mills, the product is ground
by shearing forces, therefore the particles are more
elongated. On hammer mills, the particles are ground
by impact pressure, which produces more roundshaped particles.

Influence factors on hammer mills
In feed mills, the hammer mill is the most
commonly used device, as it enables high capacities,
is easy to operate and is suitable for almost all products. Various possibilities for influencing particle
size distribution can be found on just one machine.
The factors can be divided into machine, process
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Feed Strategy - October 2019

Table of Contents for the Digital Edition of Feed Strategy - October 2019

Feed Strategy - October 2019
Contents
In the Mix
Industry Happenings
Consumers, weather, trade sway 2019 dairy feed volumes
Tips for maximizing forage in ruminant rations
How to replace corn with wheat in modern animal diets
Marketing nutrition by following trends
What AGPs can teach us about growth promotion
Broad review of research presented during 2019 ESPN
Grinding: benefits of particle size modifications
Products
Advertisers’ Index
Feed Strategy - October 2019 - CT1
Feed Strategy - October 2019 - CT2
Feed Strategy - October 2019 - Feed Strategy - October 2019
Feed Strategy - October 2019 - Cover2
Feed Strategy - October 2019 - CT3
Feed Strategy - October 2019 - CT4
Feed Strategy - October 2019 - Contents
Feed Strategy - October 2019 - In the Mix
Feed Strategy - October 2019 - Industry Happenings
Feed Strategy - October 2019 - Consumers, weather, trade sway 2019 dairy feed volumes
Feed Strategy - October 2019 - 5
Feed Strategy - October 2019 - 6
Feed Strategy - October 2019 - 7
Feed Strategy - October 2019 - 8
Feed Strategy - October 2019 - 9
Feed Strategy - October 2019 - Tips for maximizing forage in ruminant rations
Feed Strategy - October 2019 - 11
Feed Strategy - October 2019 - 12
Feed Strategy - October 2019 - 13
Feed Strategy - October 2019 - 14
Feed Strategy - October 2019 - 15
Feed Strategy - October 2019 - How to replace corn with wheat in modern animal diets
Feed Strategy - October 2019 - 17
Feed Strategy - October 2019 - 18
Feed Strategy - October 2019 - 19
Feed Strategy - October 2019 - 20
Feed Strategy - October 2019 - 21
Feed Strategy - October 2019 - Marketing nutrition by following trends
Feed Strategy - October 2019 - 23
Feed Strategy - October 2019 - What AGPs can teach us about growth promotion
Feed Strategy - October 2019 - 25
Feed Strategy - October 2019 - 26
Feed Strategy - October 2019 - 27
Feed Strategy - October 2019 - Broad review of research presented during 2019 ESPN
Feed Strategy - October 2019 - 29
Feed Strategy - October 2019 - 30
Feed Strategy - October 2019 - 31
Feed Strategy - October 2019 - Grinding: benefits of particle size modifications
Feed Strategy - October 2019 - 33
Feed Strategy - October 2019 - 34
Feed Strategy - October 2019 - 35
Feed Strategy - October 2019 - 36
Feed Strategy - October 2019 - 37
Feed Strategy - October 2019 - Products
Feed Strategy - October 2019 - 39
Feed Strategy - October 2019 - Advertisers’ Index
Feed Strategy - October 2019 - Cover3
Feed Strategy - October 2019 - Cover4
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